In addition to coming back ACL surgery, Adrian Peterson was also playing through a sports hernia last season. The Vikings running back underwent successful surgery to repair the injury in his abdominal core muscle, according to the team's official site.
"Adrian Peterson had a surgical procedure done today by Dr. William Meyers, in Philadelphia, Pennsylvania. Dr. Meyers was able to successfully repair Adrian’s abdominal core muscle injury (sports hernia). We expect a speedy recovery with no long-term concerns."
There were no details on when the injury occurred although Peterson missed a few practices in December and was listed on the injury report with an abdominal issue, reports USA Today. Peterson finished the seasons with 2,097 yards, just nine short of the NFL record.